package com.sutao.collection;

import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * @author sutao
 * @create 2020-07-23 15:32
 */
public class Test {


    public static void main(String[] args) {

        TreeMap treeMap =new TreeMap();
        LinkedHashMap ll =new LinkedHashMap();
        ConcurrentHashMap sfd =new ConcurrentHashMap();
        LinkedHashSet li =new LinkedHashSet();

    }
}
